Diesel engine control
AssigneeNissan Motor Co., Ltd.
InventorHiroyuki Itoyama
Life of this patent
Estimating the term…
Abstract
A control unit (41) sets a target opening of a variable nozzle (53) of a turbocharger (50) according to a running condition of a diesel engine (1), and controls the opening of the variable nozzle (53) to the target opening. The control unit (41) calculates a target opening area of an exhaust gas recirculation valve (6) using the target opening of the variable nozzle (53) and a target exhaust gas recirculation amount determined according to the running condition. Control of an exhaust gas recirculation amount is performed according to the variation of turbocharging pressure by using the target opening of the variable nozzle (53) as a parameter representing the differential pressure upstream and downstream of the exhaust gas recirculation valve (6).
Claims12
A control device for an engine, the engine comprising an intake passage, an exhaust passage and a turbocharger having an exhaust gas turbine in the exhaust passage and turbocharging an intake air in the intake passage according to a rotation of an exhaust gas turbine, the exhaust gas turbine having an adjusting mechanism of a cross-sectional area of an exhaust gas flow in the exhaust gas turbine, and an exhaust gas recirculation valve which recirculates part of an exhaust gas in the exhaust passage upstream of the exhaust gas turbine to the intake passage, the control device comprising:
- a sensor which detects a running condition of the engine;
- a sensor which detects the cross-sectional area;
- and
- a microprocessor programmed to:
- determine a target recirculation amount of the exhaust gas recirculation valve according to the running condition;
- calculate a target control value of the exhaust gas recirculation valve based on the target recirculation amount and the cross-sectional area;
- and
- control the exhaust gas recirculation valve according to the target control value.
A control device for an engine, the engine comprising an intake passage, an exhaust passage and a turbocharger having an exhaust gas turbine in the exhaust passage and turbocharging an intake air in the intake passage according to a rotation of an exhaust gas turbine, the exhaust gas turbine having an adjusting mechanism of a cross-sectional area of an exhaust gas flow in the exhaust gas turbine, and an exhaust gas recirculation valve which recirculates part of an exhaust gas in the exhaust passage upstream of the exhaust gas turbine to the intake passage, the control device comprising:
- means for detecting a running condition of the engine;
- means for detecting the cross-sectional area;
- means for determining a target recirculation amount of the exhaust gas recirculation valve according to the running condition;
- means for calculating a target control value of the exhaust gas recirculation valve based on the target recirculation amount and the cross-sectional area;
- and
- means for controlling the exhaust gas recirculation valve according to the target control value.
A control method for an engine, the engine comprising an intake passage, an exhaust passage and a turbocharger having an exhaust gas turbine in the exhaust passage and turbocharging an intake air in the intake passage according to a rotation of an exhaust gas turbine, the exhaust gas turbine having an adjusting mechanism of a cross-sectional area of an exhaust gas flow in the exhaust gas turbine, and an exhaust gas recirculation valve which recirculates part of an exhaust gas in the exhaust passage upstream of the exhaust gas turbine to the intake passage, the control method comprising:
- detecting a running condition of the engine;
- detecting the cross-sectional area;
- determining a target recirculation amount of the exhaust gas recirculation calculating a target control value of the exhaust gas recirculation valve based on the target recirculation amount and the cross-sectional area;
- and
- controlling the exhaust gas recirculation valve according to the target control value.
Dependencies are inferred from the claim text.